secondGenerationYears

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: secondGenerationYears

Indicates the span of years during which the second generation of something (e.g., a product, system, or lineage) is active, relevant, or in effect.